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Influenza B outbreak in a primary school in Adelaide, Australia, 2011. | LitMetric

Influenza B outbreak in a primary school in Adelaide, Australia, 2011.

Western Pac Surveill Response J

Communicable Disease Control Branch, South Australian Department for Health and Ageing, Adelaide, Australia .

Published: July 2012

AI Article Synopsis

Article Abstract

Introduction: This report describes a 2011 seasonal influenza B outbreak in a metropolitan primary school in Australia with 179 students.

Methods: Epidemiological, microbiological and environmental investigations were undertaken. A retrospective cohort study was conducted using a questionnaire that included demographic data, details of illness, chronic health conditions and vaccination status. Influenza-like illness (ILI) was defined as fever plus cough and/or sore throat. Analysis of ILI was undertaken with the χ(2) test and Fisher's exact test.

Results: Seventy-two questionnaire respondents (75%) reported illness during the outbreak - 43 with ILI, giving an attack rate of 45%. There was no association between ILI and age or chronic lung disease. Six (6%) students were vaccinated against influenza before the outbreak; although four became ill, none satisfied the ILI case definition. Seven students were positive for influenza B including two confirmed as B/Brisbane/60/2008-like; one student was positive for rhinovirus and another for metapneumovirus. The recommended influenza vaccine matched the circulating influenza strains.

Discussion: This cohort study estimated a high ILI attack rate and demonstrated low influenza vaccine coverage within the setting of a primary school. Gastrointestinal symptoms, in addition to constitutional and respiratory symptoms, were common.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3731003PMC
http://dx.doi.org/10.5365/WPSAR.2012.3.2.004DOI Listing

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